Please help me answer/perform the following with complete solution, I am really bad at STATS :

Perform hypothesis test: 15. A celebrity's endorsement of product is a common advertising technique. A group of 298 viewers shown an ad containing Aga Muhlach endorsing a product and a second group of 247 was shown the same ad but using an unknown actor. Each participant rated the commercial's believability on a scale 1 (not believable). Results were follows: Believable of Ad Type of Ad Mean Std. Den. Popular Celebrity 3.87 1.25 248 Unknown Celebrity 3.50 1.03 247 Is there sufficient evidence to indicate that the use of a popular celebrity's endorsement results in a true mean believability rating different from the true mean rating for unknown celebrity's endorsement? .05 level of significance in testing a hypothesis